Method of making spinnerets



Jan. 3, l

H. J. JONES METHOD OF MAKING SPINNERETS Filed March 25, 1926 lNVENTOR;

* r ATTORNEYS.

Patented Jan. 3, 1928.

UNITED STATES 1,654,936 PATENT OFFICE.

HARRY J. JONES, 0F IRVINGTON, NEW JERSEY, ASSIGNOR TO BAKER & COMPANY,

INC., A CORPORATION OF NEW JERSEY.

METHOD or MAKING srI'NNEBErs.

Application filed March 28, 1926. Serial No. 96,821.

In spinnerets such as are emplo ed for the manufacture of rayon orartificia silk from cellulose in solution and the like it is desired tohave a large number of minute orifices through which the solution may beextruded to form the strands of the thread,

and there are many difiiculties in drilling ofholes which can bepractically produced in a spinneret; to provide a method of making aspinneret with orifices which have been drawn, and to obtain otheradvantages and results as may be brought out by the followingdescription.

eferring to the accompanying drawings, in which the same referencenumerals designate corresponding and like parts throughout the severalviews,

Figure 1 is an enlarged central longitudinal section of a spinneret bodydrilled for carrying out my invention;

Figure 2 is an enlarged similar section of a portion of the extrudingend of the spinneret body with pieces of cored wire inserted in thedrilled apertures shown in Figure 1;

Figure 3 shows said pieces of wire expanded in their apertures and withtheir ends made flush with the surfaces of the spinneret body;

Figure 4 is an enlarged view of a complete spinneret made in accordancewith my invention, the core of the wire fillings shown in Figure 3having been removed, and

Figure 5 is a plan of the same.

Referring to the specific embodiment of the invention shown in saiddrawings, 1 indicates a spinneret body of any suitable and well-knownform and construction, although for convenience I have shown it a singlepiece of sheet metal drawn into cap shape. Preferabl for carrying out myinvention, the extru 'ng end 2 of said body 1 is of sheet metal andapertures 3 are drilled or punched therein. Longitudinal pieces 4 ofwire having a core 5 and envelope 6 are then inserted in said apertures3, the wire preferably being of such size that said pieces frictionallyfit 'in said apertures. The core 6 of said wire is wit of a material ormaterials which will be dissolved by a suitable reagent and is of a sizewhich will form an extruding orifice of the desired minuteness when itis so dissolved, the envelope and the extruding end of the splnneretbeing of a material which will not be attacked by such a reagent.

After the pieces 4 are mserted in the apertures 3 they are expandedtherein so as to engage the walls of said apertures imperviously andfirmly enough to-resist displacement, said expansion being produced forexample by pressure upon their outward ends by any suitable mechanismsuch as a hammer or press. After such expansion, the ends of the-piecesof wire are if necessary further made smooth and flush with the oppositesides of the extruding end late 2 of the spinneret by abrading or p0ishing in any suitable and well-known manner. Preferably as a last step,in order to avoid any mutilation of the orifices by operations afterthey are opened, the cores 5 are dissolved out, leaving orifices 7 andthe spinneret is complete as shown in Figures 4 and 5.

By my improved method, the extruding orifices of a spinneret may be asfine as are possible to obtain by drawing and thus much finer than it ismechanically feasible to drill. For example, if it was desired to makeorifices two thousandths of an inch in diameter, I would produce'acompound wire with a core of that diameter and an envelope of about tentimes that diameter and insert pieces of it about eleven thousandths inlength in apertures drilled in a plate of about ten and one-halfthousandths in thickness. The compound wire might have a copper or asilver core in a platinum or gold envelope, the end plate 2 ofthespinneret being also of platinum or gold, in which case nitric acidwould be employed as a reagent, or the core might be of iron in whichcase hydrochloric acid would be employed. Obviously various combinationsof materials could be employed so long as the core could be dissolvedout affecting the rest of the spinneret, and various sizes andproportions of parts could be em loyed as desired for various purposes.A so while I have described expanding pieces of compound wire in theapertures of the extruding plate, it will be obvious that they could besecured in any suitable and well-known manner and their end surfacesthen made flush with the extruding plate or not as desired. Thespinneret itself may be of any desired form or construction, so long asit has an extruding plate with a plurality of extruding orifices, andmany other changes could be made in carrying out my improvements withoutdeparting from the spirit and scope of the 111- vention, so that I wishto be understood as not limiting myself except as required by thefollowing claims when construed in the light of the rior art.

Having thus described the invention, what I claim is:

1. The method of making extruding orifices for a spinneret whichconsists in forming apertures, mounting in each of said apertures apiece of wire having a core, and dissolving out the cores of'said piecesof Wire. 7

2. The method of making extruding orifices for a spinneret whichconsists in forming apertures, expanding in each of said apertures apiece of wire having a core, and

dissolving out the cores of said pieces of wire.

3. The method of making extruding orifices for a spinneret whichconsists in forming apertures, expanding in each of said apertures apiece of wire having a core by pl'essu re'on its ends, and dissolvingout the coresof said pieces of wire.

4. The method of making extruding orifices for a spinneret whichconsists in forming apertures, expanding in each of said apertures apiece of wire having a core by pressure on its ends, making said endsflush with the apertured' surface, and dissolving out the cores of saidpieces of wire.

5. The method of making extruding orifices for a spinneret whichconsists in forming apertures, expanding in each of said apertures apiece of wire having a core by pressure on its ends, finishing thesurfaces of said ends and dissolving out the cores of said pieces ofwire.

HARRY J. JONES.

